Poppet valve



Patented Mar. 25, 1924.

rattan i JOHAN C. SIMONSEN, 0F DETROIT, MICHIGAN.

POPPET VALVE,

Application filed June 17, 1922. Serial No. 568,932.

T 0 all whomit may concern.

Be it known that I, JOHAN C. SIMoNsnN, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and State ofMichigan, have invented certain new and useful Improvements in PoppetValves, of which the following is a specification, reference being hadtherein to the accompanying drawings.

This invention relates to improvements in poppet valves and has for itsobject to improve the structure of such valves, whereby they willfunction efiiciently under considerable variations in temperature.

In the drawings,

Figure 1 is a central section through the head of the valve, the valvestem being shown in elevation;

Fig. 2 is a plan view, parts being broken away, and

Fig. 3 is a diametrical section through the disk forming a portion ofthe valve head.

The valve consists of a stem 1 having at one end an enlarged end 2 uponwhich is mounteda head 3 of dished or concaved form preferably stampedfrom sheet metal and secured upon the end 2 by means of a disk 4 whichis held within the concaved head 3 by an inturned rim 5.

The end 2 of the valve stem 1 preferably has a convex terminal face 6,the convexity extending transversely of the axis of the stem and uponthe side adjacent to the stem, the head is formed with a flaring annularface 7 of a curvature or taper corresponding to that of the centralportion of the interior of the head 3. The disk 4 has a central portion8' which when free as shown in Fig. 3, is substantially flat but whichwhen forced in contact with the convex face 6 assumes a correspondingcurvature. Surrounding the central portion 8, the disk 4 is bent out ofthe plane of the central portion 8 to form a circular tapering portion9. This tapering portion 9 is surrounded by a concave annular depression10 and about its periphery outside of the annular depression 10, thedisk flares upwardly as indicated at 11, at an angle to the plane of thecentral portion 8.

When the head 3 is in position upon the stem 1 with the disk 4, restingin contact with the end face 6Vof the stem 1 with the rim 5 rolled downupon the outer edge portion 11 of the disk 4, the disk 4 will be heldunder tension with'its central portion flexed upwardly by pressureagainst the end of the stem 1.

This construction renders the valve head capable of tilting movement inrelation to the valve stem, so that when the valve is forced into placeupon its seat 12, the head will automatically adjust itself to the seat.However, the resilient disk 4 being held under tension in contact withthe face 6 prevents rattling or looseness of the head upon the stem.This automatic adjustment of the valve head upon the seat avoids thenecessity of grinding the valve and insures full and uniformcompression. The valve finds its own seat, operates quietly and improvesin use.

The downward or inward concavity of the resilient disk 4 prevents theparts from becoming loose when heated, since as the disk expands whileit is held within the rim 5, the pressure of the central portion 8 uponthe convex face 6 increases and the valve head is thus held more firmlyupon the stem. The function of the annular corrugation produced by theportions 9 and 10, is to provide greater resiliency than if the diskwere in a uniform smooth curvature. From the foregoing description, itwill be apparent that there has been provided by the present invention,a valve in which the head is securely held in place upon the stem by aconnection which permits sufficient tilting movement to enable accurateadjustment of the head to the seat, while at the same time theconstruction is such that the increase in temperature in use will resultin the clamping action of the securing device becoming greater.

The structure is obviously capable of modification in its form,proportions, details of construction and arrangement of parts withoutdeparting from the principles involved or sacrificing anv of itsadvantages. The invention is therefore claimed broadly in any of itspossible forms or modifications within the scope of the appended claimsI claim:

1. A poppet valve comprising a stem having an enlarged end portion, ahead providing a seat for the enlarged end portion of said stem, and aconcavo convex resilient member enga ing the enlarged end of said stemand yiel dingly holding the same seated upon its seat on the head, saidmemher being engaged adjacent its edge portion by said head and heldunder tension thereby with its convex side in contact with the enlargedend of the stem, whereby the tension of engagement of said member withsaid stem end is increased by expansion of said member under theinfluence of heat.

2. A poppet valve comprising a stem having an enlarged end portionformed with a convex lower face, a head having an opening in its bottomWall through which the stem projects, said bottom wall being formed toprovide a seat for the convex face of the enlarged portion of the stem,and the annular edge portion of the head being turned inwardly toprovide an inwardly open groove, and a concave convex disk in the headwith its central portion in contact with the upper enlarged end portionof the stem and with its edge portion engaged in the groove in the head,said disk being held under tension with its convex lower side toward theenlarged end portion of the stem.

3. A poppet valve comprising a valve stem having an enlarged end ofgreater diameter than the body of the stem, said end having a convexterminal face and an opposite annular curved face adjacent to the stem,a valve head having a central opening therein and a peripheral grooveand formed concave to provide a seat for the annular face of-the stemend, and a concavo convex disk having its periphery engaged in theperipheral groove of the head with its concave face directed away fromthe stem and its convex face toward the stem, said disk having itscentral portion held under tension in contact with the convex terminalface of the end of the stem.

In testimony whereof I affix my signature in presence of two witnesses.

J OHAN C. SIMONSEN,

-Witnesses:

ARTHUR MINNIOK, KARL H. BUTLER.

